Sony made the right call. There were threats being made (by a tyrannical government, mind you) to real-world businesses and lives, just weeks after that same government followed through on a previous threat and unleashed one of the largest and most brazen cyberterrorist attacks in history.
It is not the job of a movie studio--much less a theater--to judge the credibility of threats from a terrorist state, nor to counter those threats. If a crazy man runs up to you on the street and says, "I have a gun, give me your money," you don't go, "Ho hum, I don't know, I don't want to set a precedent; do you REALLY have a gun? How big of a gun are we talking here?" No: you give the guy your wallet, and then you call the fucking cops, the guys whose job it is to take care of crazy guys who may-or-may-not-have-guns.
If there was even a .000001% chance that the threat was credible, then Sony made the only possible ethically-responsible call. Else tomorrow we might be reading a very different headline.
You want to know who to be mad at? Be mad at the government of North Korea, and at the state department which shrugged its shoulders and mumbled, "It's not a credible threat," to this whole ordeal. Be mad at a President (and I *LIKE* President Obama! I voted for him TWICE!) who lets a dictator-state bully around companies and dictate the terms of our culture.
But don't blame Sony. I know it might not seem like it, because they're this big faceless corporation that makes a lot of movies that aren't all that good, but yes, they were THE VICTIM here. And I think it's absolute crap to demonize or chastise them for not telling a violent fascist dictatorship, "G'head, I'm pretty sure you're bluffing this time; come at me bro!"